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<h1>域对象</h1>
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<tr><td>jsp内置对象</td><td>对应类</td><td>作用范围</td></tr>
<tr><td>pageContext</td><td>PageContext</td><td>当前Servlet的当前一次请求</td></tr>
<tr><td>request</td><td>HttpServletRequest</td><td>当前请求(可能会被传递给另外一个Servlet)</td></tr>
<tr><td>session</td><td>HttpSession</td><td>用户会话期间</td></tr>
<tr><td>application</td><td>ServletContext</td><td>应用生命周期内</td></tr>
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